The country's anti-graft watchdog ordered a judicial inquiry into possible criminal activity in Zuma's relationship with the Guptas, a wealthy Indian family accused of wielding undue political influence.
Zuma, 74, has weathered a series of major scandals since coming to power in 2009, but rapidly declining support for the African National Congress (ANC) party has threatened his presidency.
Fears have grown that South Africa has thrown away the optimistic legacy of Nelson Mandela's post-apartheid era -- with Zuma's alleged misconduct at the heart of public discontent.
"(The ANC) must stop putting the interests of Jacob Zuma before the interests of South Africa," it said. "The president must step down now."
Criticism of Zuma has spread in recent months, with calls for him to step down emerging from influential trade unions, corporate bosses and even senior ANC figures, as well as from opposition parties.
"The individuals who are now joining the chorus are not only the usual suspects, but, until very recently, staunch backers of Zuma's ANC," the Times daily said in its editorial today.
The probe released by the Public Protector watchdog detailed allegations that Zuma ensured the Gupta family won huge preferential contracts with state companies and were able to choose cabinet ministers.
Deputy Finance Minister Mcebisi Jonas told the investigation he was taken by Zuma to the Guptas' home in Johannesburg where Ajay Gupta said he would be appointed finance minister.
When Jonas refused, Ajay allegedly offered him 600 million rand (USD 44 million) and asked if Jonas had a bag to take away 600,000 rand in cash immediately.
The Guptas have denied all wrongdoing, and today welcomed an official inquiry.
Disclaimer: No Business Standard Journalist was involved in creation of this content
